:D
A very big thank you to all you great guys who replied. Much truth in all you said. Yes, it was a new PCB and he did fix the fuse - I was panicking, so thanks too for putting my mind at rest! But many would panic after 15 days in the cold!! It cost a lot, but as the Combi 80 is about 7...
Thanks to everyone who replied to my last query about plumber or electrician. Update (and new question):
A Corgi engineer (plumber and qualified to do electrics on 70k boiler) came to have a look at this non-functioning boiler (no lights not even the mains - tho another electrician got it...
This 7 year-old boiler dead as dodo last Thursday - no heating, no hot water. Water had been very hot. Recent banging in pipes and 2 lockouts had responded to resets until last week when, for first time, even the mains light had gone out. Corgi plumber came Sat. Said boiler looked fine - no...